Selective signaling system.



J. HELD.

SBLBGTIVE SIGNALING SYSTEM.

APPLIUATION FILED AUG. 23, 1912.

Paten'd Feb. 9,1915.

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, ill" GRAN A21-"2S, NEW JERSEY, ASSIGNR T0 WESTFLN ELECTRIC SEE'JJTIVE .SEGNALING SYSTEM.

Speeicafon of Letters Yatent,

.iplieaden filed august 23, i922. Serial-Eo. 716,643.

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' naling` Systems, of which he following; ie a i'ulh clear, concise, and exact description.

This invention relates 'to seleoive signaling svsiems of the olass in which a plurality of Wag/si 'lons located upon a line are each provided with selective circuit closing deviees iof: operating a looalsignal more particularly' to a. system in which a plus reli'y of these lines emanating iroio a een trai olf: Common siation are arranged for inieiealling or inercoiniriunioating.

The ohjee of the invention is in general to provide new and improved means in a sysem of this class whereby all of the lines emanating from eonnnon 4saion may he operated from a Common soureeof current- Without interference between the various eirouiis.

ln aeeordanee with this invention there. is provided in each of the lines an impulse relay which is operable by means of a eireuil; including' the line Wires and theV oeniral source and is adapted when operated lo connect Jshe said common source Wieh the line Wires for operating .the selectors. The impulse rela;7 being' constantly in theY hatej. Circuit must dijeren-iate hetween he selector operating eurrent and the eurreni io 'which ii"j responds and this is aecomplisheilhy proriding lrhis relay with windings which aci dii'erentially to oui-reni ihrouih thorn in series. hui. aid when in multiple.

The' drawing is a diagram of the apparatus and inner-.tions of a sysiein embodying; his inrenion.

ln i'he drawing ihere are shown fyao pairs oi line 5, G and C each having a sending station A., and two naYSi'aiions ii and C oonneuied therewith. The equipmen at each of these Yvaystaions is the same and comprises slow and quick aeiiing maanes 9 and l0 designated as holding and stepping' ina L els, and holding and stepping pawls .il and l2 controlled by said magnets 9 and l0 to aClYan/Ce a ratchet `rwheel ll-. The lralehei; Wheel operates in its advancement lo oloseeonae: 'lll ifo eoniplete the eirouit off a local sigial i ai; the Way saion. The holding and stepping magnets are eonneeged in series with each other and in bridge of the .line wires 5 and 6. included in the bridge with the holding and stepping Ymagnets are retardation coils 16 and l? and a variable resisisance 1&9 the retardation coils being' for the purpose.V of protecting ehe selector against lightning discharges and the variable resisiance being provided for tapering the lineY resistance.

i lso located at each of the Waystations isv an impulse transmitting device 2O control* ling wo contacts 21 and 22 which when closed in the operation :of the transmister connerie ground with the line conductors 5 and 6 through uf'indingsl and 26 of a coil and the retardation coils 16 and 17.

riihe operating current for the selectors of each pair of line Wires is furnished by a source of current located at the sending staiion and having one pole grounded at 3l. Associaled Willi each of the lines at the sending station is an impulse relayY 32 each ha 'ving two windings 83 and Se. The Winding` of each of the relays has one terminal Connected directly with the line Wire 5 and the other connected with the non-grounded pole of the source of ourrenl:V 30 through condueixors 35 and 36. @ne terminalof the 'winding 3l of the relayf is connected with the line Wire 6 WhileVY the other e-rminal thereof is normally connected with the nongrounded pole of the soureeof current 30 throughfa normally closed Contact 37 oon- Jrolled by the relay and a resistance 38. The operation of the relay will close a eoniaet l0 and open he Contact 37 disconneeing the lWinding 34 from Jlche non- Ygrounded pole of the sourcel of current 30 Yand connecting; it with the opposite pole thereof, the purpose of which will be more clearly set forth in the descriptiono the operaizion of the system. The windings 33 and ei oif the relaja' 3Q are differentially related wih respectvv to eurrent passing through che line wires in series hut aiding with iespeoiI lo current over the `two line wires in parallel.

Referring new to the operation of the system ii; will he assumed that the attendant at station B on one of the lines desires to signalihe saion C or any other station on the saineflinelr ln orderio do thisy he will operatehis impulse transmitter 20 which han on it notches oorresponding in number Jaiented Fein 9, 19155,

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lment ot the teeth on tlie periphery of said i lthroiigbflrhiiek winding of the relay 32 vis "after it operates, and said'ielay can therey with the number of curi-ent impulses required to close the signalling contact of the selector at the de `red station.

The impulsey Wh el 2Q=fcarries an arm 68 having its free cnil insulated and bearing 'upon a spring 66 ,inthe normal position of the wheel 20 to maintain the contact 22 open.'

Y As soon however-as tlie-\\i"heel 2O starts to rotate, this arin'GS beco'nes disengaged from` the spring 66 and `,perifnits it to close contact 22an`d maintain-itclsed until the wheel 20 completes itsrlrevoliition. An arm 67, en gaged by teeth `on the Wheel 20,l intermitf tently closes /contact21 in the rotation of the iiheel"20,.in accordance with the arrangewheel.

The contacts 21 and 22 are bridged togethcr so that as the contact 21 is made and broken ground will be intermittently connectcd Vwith the tivo line Wires and an energizing circuit will/be completed for the impulse relay 32 which circuits may be traced as follows: One will be from ground through contact 21, tinding 25," retardation coil lline conductor y5, Winding 38 of relay 32'A and conductors 35 and Sti/to the -battery 3Q; the other being "from//ground through. the contact 21, contactA 22g/winding. 26, lretardation coil 16, ,linel conductor 6, Windingii of relay 32,fcontact 37, resistance 38 and conductors and 3G to the source of current 30. Current through either/or both of these vcircuits just traced will energize the relay 32 which Will operate to close the contact 40 and open thefcontact 37. The opening of the contact 37 `will interrupt the energizing circuit of the Winding 311, and coinplete an energizing circuit for`the selector which may be traced as follows: from the non-groundcd pole of the source of energy 30, over conductors 3G and 35, the Winding 33 Voli the relay 32, line conductor 5, retardation coil 17, stepping and holding magnets f -10 and 9 of the selector, variable resistance 18, retardationcoil 16,fline conductor 6, winding 34 of the relay 32,econtact 40 of said relay, kconductors 5 0, land 52 to -the grounded pole o'y the,y sourceof` current 30.

y'This path includes thc two windings 33 and 34 in series so that the relay 32fivill be con nected differentially 'and will not-remain energized after the'contact 21 is opened. The ari-angemeiitwhereby the energizing circuit broke-ii' a'tte'r'the operation 'of the relay is of importance in a scheme of 'this sort as it means thtatjany leaks to ground which might have tlic eifect of preventing the release tlie relay when operated fromiiyieneofthe ii'aystations,`are practically halved in value tore be released through practically twice the amount'ovf'fleak that it would be possible to release it'tfhroughf if it is receiving current over both sides of the line. In other words the operation of the relay 32, by open# ing one of the parallel paths over which it is normally energized, increases the resistance of thepath for current through it to approximately twice the value over which it was originally energized, so tb at the current flowing through the relay before opening the remaining path is only about oneshalf ot' the original energizing current? Conhected inthe line Wires 5 and 6 at tlie sending station are 'retardation coils 60 and 61 acting in conjunction with a condenser 62 bridgedacross said line wires to smooth out or graduate the current impulses used in sclecting so that no disagreeable click or thump will be heard in receivers which may be connected With the line wires during a signaling operation.

The resistance 38 is non-inductive and serves as a temporary discharge path for the',`

retardation coils 60 and 61 l'and the. condenser 62 in order thatithe current impulses ou a heavily loaded line Will not betoo prolonged topermit the proper operation of the stepping magnet.

The' `impulse relay 32 may be operated` from the sending station by means cfa transmitting device 65 which when operated completes 'a circuit through the Winding of said relay from the battery 30 which may be traced from the grounded side of saidbattery, over conductor 52, conductor 51, the contact controlled by 65ivinding 33 and conductor 36 to the non-grounded pole of the battery 30. Current over this circuit energizes the relay v32, causing it to close the contact 40 to connect battery with. the line Wires 5 and 6 to operate the selectors.

The scheme described provides for the operationy of a number of Y separate circuits from a single source of current thus avoiding the use of a number of Separate sources requiring a large number of cells the installation and maintenance of which is a material item of expense.

1. In a selective signaling system the coni-r bination with line Wires having'a sending station and a plurality ot waystatioiis connected therewith, of a selector in bridge ot said line Wires at each of said Waystations responsive to current impulses, a source ot current at said sending station, an impulse relay at said sending station connected with said source of current and said selectors lfor intermittently connecting said source of curvrent with tlie line Wires, said relay having :meansiifor renderingiliit.f nonfresponsi ve to said selector operating current, and apparatus and connections at said Wavstations and said sending station for completing an operating circuit for said relay including said sourceof current.

2. ,Ina selective signaling system the cbm- 1,127,5s7c Y i bination with line wires having a sending station and a plurality of-waystations connected therewith, of a selector in bridge of said 'line Wires at each ot said waystations responsive to current impulses over the line wires in series, a sourceo cnrrent at the sending station, `electromagnetic means connected with said source and said selectors for impressing selector operating currents 1c upon the line wires, said electromagnetic means having means for rendering it uonresponsive to said selector currents, and ap- ,paratus and connections at said sending and waystations for completing an operating circuit for said electromagnetic means.

3. In a selective signaling system the combination with line wires having asending station and a plurality of waystations connected therewith, of a" selector in bridge of 204 said line wires at each of 'said waystations responsive to current impulses, a source of current, an impulse relay connected in `said line Wires between said ,source of current and said selectors for intermittently `cennectin'g said source of current with the line wires, said relay being provided with two V.Winding etlective when in multiple but ineffective when in series, andmeans at each of said waystations for connecting said windings in multiple.

i. ln a selective signaling system the coinbinatioii with line wires having a sending station and a plurality of waystat-ions 'con` nected therewith, of a selector in' bridge of 85 said line wires at each of said waystations responsive to current impulses over the two line wires in series, a source of current, an impulse relay having two windin rs connected in said line wires betweenv sai source'of 40 current and said selector-@said lwindings being differentially related when in series and aiding when in multiple, means contrblled i at 'each of'said waystat-ions for connecting i said` windings in multiple' and inans controlled by said relay in ,its operation for '45 l connecting said windings in series.

5. -In aselcctive signaling s vstein the comvbinationwithline wires having a sending station and a plurality of waystations connected therewith, of a. selector in bridge of 50 .y

.of said waystations for connecting said windings in multiple, means controlled -by said relay in itsl operation for connecting said windings in series, and means also controlled by said relay in its operation. for opening the energizing circuit through one of said windings.

"6. Zin a selective signaling system the cornbination with a. plurality of pairs of line wires emanating from a common station andhaving a plurality of waystations connectedJ therewith, a selector in bridge 'of each pair of line wires at cachot said stations responsive to 'current impulses, a singie source of current located at a central station for operating said selectors, an impulse relay foreach pairf'of-line wireslocated at said common station, andy operable 75. liv current from said source; and means at each of saidnvay stations for grounding the two line wires to complete an operating circuit for the relay of its particular line inf dependently of the other relays of-the other lines.

In Witness whereof, I hereunto subscribe my naine this 22nd day ot August A. D.,

- y JOSEPH C. FIELD. y

Witnesses lf'VAnfinR FREDERICK HOFFMAN,

ELLAl EuLEii. 

